Twilio: How to Connect with Existing Voice Assistant

Twilio: How to Connect with Existing Voice Assistant

Today's post serves the purpose of explaining Twilio's recent bidirectional streaming feature, the very feature which made it possible to receive the call audio while still being able to send audio for playback asynchronously.

Today's post serves the purpose of explaining Twilio's recent bidirectional streaming feature, the very feature which made it possible to receive the call audio while still being able to send audio for playback asynchronously.

This was not possible before, when communication had to be unidirectional: either you could receive the voice audio but could not respond to it, or you could send audio to the call but not get anything back.

Let's get right into the tutorial. One needs to understand three things if he or she hopes to use Twilio in conjunction with her own Voice Assistant (abbreviated VA).

  1. How the backend of the VA receives the user's voice and returns audio responses (HTTP or Websocket? Streaming or one-off? In which audio format?)

  2. How to serve calls using a node.js server (How can a phone call to a twilio number perform a request to a Node server?)

  3. How to open and use a bidirectional communication channel between node.js code and the actual phone call (Through which protocol?)

nodejs chatbots cloud-telephony node

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